Air supply apparatus for fuel cell systems, and fuel cell system

Abstract

The invention relates to an air supply device (1) for fuel cell systems (2, 3) with a flow compressor and an electric drive motor (4) for the flow compressor, wherein the flow compressor has two compressor wheels (6, 7) which are essentially symmetrical and which are arranged, together with the electric drive motor (4) there between, on a common shaft (5). The air supply device according to the invention is characterized in that the two compressor wheels (6, 7) are connected on the pressure side to two systems (2, 3, 10, 13) which are pneumatically not permanently connected. A fuel cell system (2, 3) which uses such an air supply device (1) is also claimed.

1 . An air supply device for fuel cell systems having a flow compressor and an electric drive motor for the flow compressor, wherein the flow compressor has two compressor wheels which are essentially symmetrical and which are arranged, together with the electric drive motor arranged there between, on a common shaft , characterized in that the two compressor wheels are connected on the pressure side to two systems 13) that are pneumatically not permanently connected. 
     
     
         2 . The air supply device of  claim 1 , in wherein system. 
     
     
         3 . The air supply device according to  claim 1 , wherein the pneumatically not permanently connected systems are a compressor side and a turbine side of a free-running turbocharger. 
     
     
         4 . The air supply device of  claim 1 , wherein the pneumatically not permanently connected systems 3, are controllably connected via a bypass line provided with a valve. 
     
     
         5 . The air supply device of  claim 1 , wherein a device for supplying liquid into the compressed air flow is provided, which in particular has at least one nozzle for atomizing the liquid in the compressed air flow. 
     
     
         6 . The air supply device of  claim 3 , wherein the free-running turbocharger has a hydrodynamic bearing. 
     
     
         7 . A fuel cell system with at least one fuel cell, wherein the fuel cell is supplied with at least part of the air from an air supply device of  claim 1 . 
     
     
         8 . The fuel cell system of  claim 7 , further comprising an anode side and a cathode side of the at least one fuel cell, and with an air supply device wherein the output of the cathode side can be connected in a controlled way optionally or proportionately with the environment and/or a recirculation line, wherein the recirculation line opens out between one of the compressor wheels and the compressor side of the free-running turbocharger. 
     
     
         9 . The fuel cell system of  claim 7 , further comprising a recirculation of anode exhaust gas, which takes place at least partially via a recirculation fan, characterized in that the recirculation fan is coupled to an exhaust air turbine, which is driven by the exhaust gas of the fuel cell, in particular the cathode exhaust air. 
     
     
         10 . The fuel cell system of  claim 9 , wherein the coupling between the exhaust air turbine and the recirculation fan is designed as a magnetic coupling. 
     
     
         11 . The air supply device of  claim 2 , wherein the pneumatically not permanently connected systems are controllably connected via a bypass line provided with a valve. 
     
     
         12 . The air supply device of  claim 3 , wherein the pneumatically not permanently connected systems are controllably connected via a bypass line provided with a valve. 
     
     
         13 . The air supply device of  claim 2 , wherein a device for supplying liquid into the compressed air flow is provided, which in particular has at least one nozzle for atomizing the liquid in the compressed air flow. 
     
     
         14 . The air supply device of  claim 3 , wherein a device for supplying liquid into the compressed air flow is provided, which in particular has at least one nozzle for atomizing the liquid in the compressed air flow. 
     
     
         15 . The air supply device of  claim 4 , wherein a device for supplying liquid into the compressed air flow is provided, which in particular has at least one nozzle for atomizing the liquid in the compressed air flow. 
     
     
         16 . The air supply device of  claim 4 , wherein the free-running turbocharger has a hydrodynamic bearing. 
     
     
         17 . The air supply device of  claim 5 , wherein the free-running turbocharger has a hydrodynamic bearing. 
     
     
         18 . A fuel cell system with at least one fuel cell, wherein the fuel cell is supplied with at least part of the air from an air supply device of  claim 2 . 
     
     
         19 . A fuel cell system with at least one fuel cell, wherein the fuel cell is supplied with at least part of the air from an air supply device of  claim 3 . 
     
     
         20 . The fuel cell system of  claim 8 , further comprising a recirculation of anode exhaust gas, which takes place at least partially via a recirculation fan, wherein the recirculation fan is coupled to an exhaust air turbine, which is driven by the exhaust gas of the fuel cell, in particular the cathode exhaust air.